National Weather Service Forecast for: San Marcos CA
Issued by: National Weather Service San Diego, CA
Updated: 2:09 am PDT Jul 25, 2025
 
This
Afternoon
This Afternoon: Sunny, with a high near 76. West wind around 10 mph, with gusts as high as 20 mph.
Sunny
Tonight

Tonight: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 59. West wind 5 to 10 mph becoming light northwest  after midnight.
Patchy Fog
Saturday

Saturday: Patchy fog before 11am.  Otherwise, mostly sunny, with a high near 74. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Patchy Fog
then Sunny
Saturday
Night
Saturday Night: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 58. West wind 5 to 10 mph becoming light northwest  in the evening.
Patchy Fog
Sunday

Sunday: Patchy fog before 11am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 76. West wind 5 to 10 mph.
Patchy Fog
then Sunny
Sunday
Night
Sunday Night: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 59.
Patchy Fog
Monday

Monday: Patchy fog before 11am.  Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 79.
Patchy Fog
then Sunny
Monday
Night
Monday Night: Patchy fog after 11pm.  Otherwise, increasing clouds, with a low around 61.
Patchy Fog
Tuesday

Tuesday: Patchy fog before 11am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 81.
Patchy Fog
then Sunny
Hi 76 °F Lo 59 °F Hi 74 °F Lo 58 °F Hi 76 °F Lo 59 °F Hi 79 °F Lo 61 °F Hi 81 °F

 

This Afternoon
 
Sunny, with a high near 76. West wind around 10 mph, with gusts as high as 20 mph.
Tonight
 
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 59. West wind 5 to 10 mph becoming light northwest after midnight.
Saturday
 
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 74. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
 
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 58. West wind 5 to 10 mph becoming light northwest in the evening.
Sunday
 
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 76. West wind 5 to 10 mph.
Sunday Night
 
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 59.
Monday
 
Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 79.
Monday Night
 
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 61.
Tuesday
 
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 81.
Tuesday Night
 
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 62.
Wednesday
 
Patchy fog. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82.
Wednesday Night
 
Patchy fog. Otherwise, increasing clouds, with a low around 63.
Thursday
 
Patchy fog. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 81.

 

Forecast from NOAA-NWS for San Marcos CA.